I need help with these. Please show workings
2 answers:
Answer:
Imp = 25 [kg*m/s]
v₂= 20 [m/s]
Explanation:
In order to solve these problems, we must use the principle of conservation of linear momentum or momentum.
1)
where:
m₁ = mass of the object = 5 [kg]
v₁ = initial velocity = 0 (initially at rest)
F = force = 5 [N]
t = time = 5 [s]
v₂ = velocity after the momentum [m/s]
2)
<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Question 1)</h2><h2>_____________________________________</h2><h3>DATA:</h3>
Force = F = 5N
time = t = 5 seconds
mass = m = 5 kg
momentum = p = ?
<h2>_____________________________________</h2><h3>SOLUTION: </h3><h3>IMPULSE FORCE:</h3>The force which acts for a very short period of time is called impulse force. It is given by,
I = F x t
Where,
I is impulse
F is force
t is time till which force is exerted
The impulse experienced by the object equals the change in momentum of the object. In equation form,
F x t = M x ΔV
So,
F x t = Final momentum - initial momentum
F x t = final momentum - (0)
initial momentum is zero because the object was initially at rest.
Final momentum = 5 x 5
Final momentum = 25
So B is the answer
<h2>_____________________________________</h2><h2>Question 2) </h2><h2>_____________________________________</h2><h3>DATA: </h3>Force = F = 30 N
time = t = 0.05 seconds
mass = m = 0.075 kg
V = ?
<h2>_____________________________________</h2><h3>SOLUTION:</h3>impulse force is given by,
I = F x t
Where,
I is impulse
F is force
t is time till which force is exerted
The impulse experienced by the object equals the change in momentum of the object. So,
F x t = M x ΔV
So,
F x t = Final momentum - initial momentum
F x t = final momentum - (0)
Since it was at rest initially, initial momentum is zero.
Momentum is given by,
p = m x V
where,
p is momentum
m is mass
v is velocity
<h3>So,</h3>F x t = m x V
Rearrange the equation,
V =
So C is the answer
<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2>You might be interested in